Cholepyrrhin is a rare medical term that relates to a red-green color blindness. The word is difficult to spell as it contains a combination of silent letters and unusual letter combinations. Its phonetic spelling is /kəʊlɛpiːrɪn/, which consists of six syllables. The "ch" and "ph" are silent, and the "e" after "l" is elongated. The word contains a combination of different phonemes making it a challenging word for those who are new to it. However, with practice, one can master the spelling and the pronunciation of this complex term.
Impure bilirubin, biliphein.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.